Breeding of New Variety"Wanxiangsimiao"with Early Maturity,High Yield and High Quality and Its Genetic Analysis of Yield and Quality
Wanxiangsimiao,derived from the hybridization of the Molizhan and Huanghuazhan,was approved by the NCVEA Committee in 2020 year.It is a late indica rice with early maturity and high quality by conventional breeding techniques and molecular marker-assisted selection.It has the characteristics of high yield,early maturity,high quality,strong fragrance,heat resistance and resistance to bacterial blight.The phenotypic traits such as heat tolerance,aroma,gelatinization temperature and blast resistance were identified from F3:4 population,and were selected by the functional markers.This variety is suitable for planting as late season rice planting in the middle and lower reaches of the Yangtze River.It also demonstrates adaptability for early-season or medium-season rice planting.The whole growth period was 116.0 d,and the average yield of 2-year regional trial was 617.32 kg/667 m2.Its grains exhibit an appealing length-to-width ratio of 3.5,chalkiness and amylose content of 2.2%and 14.8%,which quality traits reach to the second level of the national standard of good quality rice.This paper mainly introduced the breeding process,variety characteristics and high-yield cultivation techniques of Wanxiangsimiao with fragrance,early maturity and high quality.Furthermore,by carrying out whole genome sequencing and functional gene research,we have uncovered that Wanxiangsimiao aggregated several excellent genes from both its parents,such as the heading stage genes Hd1,Ghd8 and DHD1,yield genes Gn1a,GSN1,PAY1,GLW10,qSG11.1 and GW8,quality genes fgr,PUL,OsSSⅢa,GluA-1,ALK and Sbe3.The genetic mechanism of early maturity,high yield and high quality was analyzed from the genome level,which can provide a new theoretical basis and practical guidance for rice breeding.
万方数据
维普
